audion

One such receiver is the audion, which we shall now describe.

If you want to hear clearly and keep outside radio out of your machine, use a regenerative radio set with an audion detector.

These Vesta batteries are the "A" batteries used for heating the filaments of the audion bulbs.

This is the audion, which is the distinguishing feature of the De Forest wireless telegraph and wireless telephone.

The audion is a small glass bulb from which the air is exhausted to a high degree of vacuum.